18144533904880 has 80 divisors (see below), whose sum is σ = 43338026438784. Its totient is φ = 7059729623040.

The previous prime is 18144533904857. The next prime is 18144533904881. The reversal of 18144533904880 is 8840933544181.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×18144533904880² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18144533904881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10037625 + ... + 11706535.

Almost surely, 2^{18144533904880} is an apocalyptic number.

18144533904880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18144533904880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21669013219392).

18144533904880 is an abundant number, since it is smaller than the sum of its proper divisors (25193492533904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18144533904880 is a wasteful number, since it uses less digits than its factorization.

18144533904880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672634 (or 1672628 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 58.

The spelling of 18144533904880 in words is "eighteen trillion, one hundred forty-four billion, five hundred thirty-three million, nine hundred four thousand, eight hundred eighty".